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F. J. G. PROMHOLT.

ROTARY BORBR WITH DIAMOND BIT.

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F. J'. Gr. FROMH-OLT. ROTARY BORER WITH DIAMOND BIT. No. 530,408.4 Patented peo. 4, 1894.

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ROTARY BOBBR vWITH DIAMOND BIT.

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UNITED STATES- PATENT 7 OFFICE..

FLIX JULES GREGOIRE FROMHOLT, or PARIS, FRANCE.

ROTARYBORERWITH DlAMoND BIT'.

SPECIFICATION forming` part of Letters Patent No. 530,408, dated December 4, 1894..

Application iiled September 8, 1893. ltenewed November 2, 1894- y SteriallNto. 527,768.` (No model.) Patented in France February To all whom it may concern:`

Be it known that I, FLIX JULES GRGOIR FROMHOLT, mechanical constructor, of Paris,

in the Republic of France, haveinvented a new Rotatory Borer with Diamond Bits; (foriwhich I have obtained Letters Patent of France for fifteen years, No. 219,402, dated February 15, 1892;) and I do hereby declare that the following is a full and exact description thereof, ref-` erence being made tothe accompanying draw- Ings. 4

In the drawings, Figure l, is a side view of the boring machine in place in the mine. Fig. 2, is aplan view of the same; Fig. 3, a detail relating to the frame. Fig. 4, represents in section the boring bitand the hollow shafting for operating the same. Fig. 45, is a simi-` lar view of the shafting showing the connection for giving it longitudinal movement. Figs. 7 and 8 are detail views showing trans verse sections of Figs. 4 land 5. Fig. 9, is a sectional viewof the outer tube of the bit carrier before the recesses are formed therein for the diamond holders. y Fig. 10, is a plan view of the same. Fig..11, is a sectional view of the inner ring or tube of the bit` before the sockets are formed therein for receiving the diamond pieces. Fig. 12, is a plan View of the Same. Figs. 13 and 14 show an outer tube detached from its carrying tube which is also shown in Section, Fig. 14, showing also the recesses formed in the outer tube for the diamond holder. Fig. 15, is a plan view of Fig. 14. Fig. 16, is a sectional view of the inner tube 0r sleeve as complete. Fig. 17, is a plan viewof the same. Fig. 18, shows the several Fig. 19, is a plan View of the same with the diamond holders in section, and Figs. 2O and 2l are details of the diamond pieces. r

This borer comprises four parte as follows: first, the diamond bit; second, vthe borer; third, the motor, and fourth, the frame and its carriage.

The bit-The bit C (in the accompanying drawings) is composed of two concentric tubes (Figs. 4 and 6), which allow of bringingtogether the soldered or riveted pieces of metal which carry the diamonds.

5o The arrangement allows of using diamonds of smallsize, of bringing all the points out on the section of thebit, andofeasily replacingthe metallicpieces, which carryithe diamonds.

It will be noticed that the outer tube of the diamond bit O'Figs. 14, 15, ist'ormed with in- -wardly `flaring dovetailed sockets fu to receive the diamond holders V, Fig. 20, and also the :Semicircular sockets 'Lt to receive cylindrical idiamondholders u. The inner ring or Sleeve 1J, Figs. 16 and 17 has corresponding semicircular sockets to register with the sockets u fo'r holding the diamond piece u and the out- 1V are also held bythese two tubes, thepieces 'V w being retained in the tubeC by the tube J and the pieces vw retained in the tube J by the tube C.

The boren- The borer comprises two con-A ;centric tubes A and B (Figs. 4 and 7). The 4inner tube B carries the bit C screwed at a' ,to one of its ends. It turns with theouter gtube A and slides in it. For that purpose a- 'socket E fixed by means of a screw to the tube QA, carries two keys ot which pass through this tube A and support the inner tube B. The `latter is provided with two grooves 5 throughout its entire length, whereby it can glide in the fixed keys and rotate with the outer tube A. At its other end (Figs. 5 and 8) theinner tube B is provided with a piece of ferruled leather F, which makes a joint in the outer tube A. The forward movement is obtained by water pressure fed by the fitting G on the Saidleather piece. At the center of the piece carrying the leather F is bored a hole V,`which gives passage to the water necessary for cooling down 4the bit and for washing the hole.

The lnzot0r.'l`he movement in the working parts, which are permanently fixed, can be obtained either by cable or belts. For use in a mine gallery or for apparatus intended to be moved, the motive power is got by the help of a'dynamo-electrical engine D, the armature of which is supported on the outer tube A.

(Figs. 1 and 2). This motor, placed in the cen-l ter of the length of the tube A Operates direct and without transmission and at the required f the dynamo-electrical machine D. So these three pieces form a whole.

The frame H (Figs. 1 and 2) is mounted in trunnions on a carriage I on which it canineline, the tightening screws L allowing of its l being fixed in the required position.

The carriage I, in two parts, is clamped on a cylindrical pillar K on which it can. be raised or lowered by means of the rack S and the pinion T controlled by a crank-arm. l A,

For apparatus having a large diameter, the

pillar K, which serves as a support, can be replaced by two or more pillars connected together so as to render the apparatus more stable.

The carriage M carries also the rheostat R for the starting of the dynamo-motor. It moves on the rails O by means of rollers N. A screw P and nut Q serve for tightening the pillar against the top of thel gallery of they This pil-l mine, and of fixing it in position. lar K can, besides, be removed from the carriage'and arranged horizontally in tightening it between the side walls of the gallery.

1. A boring bit comprising two concentric rings having sockets extending between them longitudinally and opening at the lower face of the rings and the diamond points carried by and between the rings in the longitudinal sockets, said points projecting out in the plane of theline of division between the rings, substantially as described.

2. In combination the two concentric rings, V' one of them having sockets formed therein` extending longitudinally between the meet-v ing faces and iiaring radially andthe diamond carrying pieces arranged in said sockets and held by the adjacent rings, substantially as described.

ment to the carrier and as the cylinder therefor, substantially as described.

et. In combination, the frame comprising the standard K, and the bearings 6, the tubular part A in said bearings, the motor D on the shaft to rotate the same, the said part A being held with the rotary driving means against longitudinal movement the drill, the part carrying the same sliding in the outer rotary part A and splined to the interior thereof to rotate withthe same, the piston on the inner part, and the liquid supply fitting G at the end of the rotary tube A, substantially as described. l

5. In combination, the post K, the split frame I embracing the same and having a pinion engaging a rack on the post, said frame I being made in two sections, the frame H carried by the split frame I and having bearings for supporting the rotary shaft the said frame being adjustable on the split fra'me by the screws L, the bit and the electric motor on the rotary shaft, substantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

FELIX JULES GREGOIRE EEOMHOLT.

Witnesses: l

GEORGE LAURENT, EUGENE WA'rTIoE. 

